KR20090060049A - Method for assigning rights of issuing rights object and system thereof - Google Patents

Abstract

A method for assigning rights of issuing rights object and a system thereof are provided to control an LRM(Local Rights Manager) with only permitted operation efficiently by making an RI(rights Issuer) to issue a letter of attorney to the LRM. A CA(Certificate Authority) issues a certificate to an LRM, and the LRM request mandate from the LRM. The RI processes the mandate request message, and sends the mandate response message to the LRM. The LRM gets contents from another DRM(Digital Rights Management) and transfers the transfer request message to a DRM agent. The DRM agent processes the transfer request message.

Description

METHOD FOR ASSIGNING RIGHTS OF ISSUING RIGHTS OBJECT AND SYSTEM THEREOF}

The present invention relates to digital rights management (hereinafter referred to as DRM), and more particularly, to a method and system for delegating authority to issue rights of use.

DRM is a system technology for safeguarding and systematically managing the rights to digital contents, and provides a series of protection and management systems for preventing illegal copying of contents and acquiring the right to use the contents, creating and distributing the contents, and using them. do. Such DRM is applied to various applications such as a media player, an audio player, an image viewer, and the like.

1 is a block diagram illustrating a digital rights management system, and the digital rights management system controls the content provider to use the content delivered to the user as much as the usage rights granted to the user. In this case, the content provider is an entity corresponding to a content issuer (CI) and / or a right issuer (RI).

The content issuer (CI) issues protected content (i.e., DRM content) using a specific encryption key to protect the content from users who do not have access rights, and the rights issuer (RI) issues the protected content. Issue the Rights Object (RO) required to use it.

The DRM agent is mounted on a terminal to receive the protected content and the right to use, interprets the license included in the right to use, and converts the protected content into a form that can be used on the terminal. To control.

The LRM, which is issued a certificate from a Certificate Authority (CA) trusted by the DRM Agent, can import any external DRM (including copy control system) and deliver it to the DRM Agent. However, since LRM can import without restriction, it has an effect of converting all contents protected by another DRM system into contents of a predetermined DRM system. In light of the technical ideas of DRM designed to prevent piracy, it can be said that the rights are excessively assigned to LRM. Therefore, we need a way to restrict the import of LRM.

Therefore, in the present invention, the RI delegates a predetermined authority to the LRM through issuance of a power of attorney, and the LRM issues an RO to the DRM agent within the delegated authority. In addition, when the RO issued by LRM is to be transmitted through RI, the RO can be delivered to other DRM agents through RI posted on the power of attorney.

When an RI issues a mandate to an LRM to effectively control only LRM authorized operations, and then the DRM Agent requests RI to move the LRM-induced RO to another DRM agent, the RO is delegated by the RI. It provides a way to authenticate that it is derived from:

Therefore, in the present invention, the RI delegates a predetermined authority to the LRM through issuance of a power of attorney, and the LRM issues an RO to the DRM agent within the delegated authority. In addition, when the RO issued by LRM is to be transmitted through RI, the RO can be delivered to other DRM agents through RI posted on the power of attorney.

Definition of Terms:

Constraint A restriction on a Permission over DRM Content (DRM V2.0). Content One or more Media Objects (DRM V2.0). Domain A group of Devices defined by a Rights Issuer such that the Rights Issuer can issue Rights Objects for the group that can be processed by all Devices within the group, and only those Devices (DRM V2.0). DRM  Agent The entity in the Device that manages Permissions for Media Objects on the Device (DRM V2.0). DRM  Content Media Objects that are consumed according to a set of Permissions in a Rights Object (DRM V2.0). Import To convert Import-Ready Data into OMA (P) DCFs and ROs. Local Rights Manager ( LRM ) An entity that is responsible for aspect (s) of Import and it may also manage an Imported-Content for a limited group of OMA DRM Agents. Permission Actual usages or activities allowed (by the Rights Issuer) over DRM Content. Rights The collection of permissions and constraints defining under which circumstances access is granted to DRM Content. Rights Issuer An entity that issues Rights Objects to OMA DRM conformant Devices (DRM V2.0). Rights Object A collection of Permissions and other attributes which are linked to DRM Content. State information A set of values representing current state associated with Rights. It is managed by the DRM Agent only when the Rights contain any of the stateful constraints (e.g. interval, count, timed-count, accumulated, etc.).

Delegation is:

Delegation is the act of giving an authority to another entity so that the entity can take over the authority. Technically, if Entity A issued a power of attorney to Entity B, Entity B electronically signed a message with the name of Entity B and sent the power of attorney from Entity A to Entity C, Entity B sent Entity C on behalf of Entity A. It's like sending a message to someone. A description with reference to FIG. 3 is as follows.

The power of attorney should include at least the ID of the delegator, the ID of the person in charge, the delegation period, the authority to delegate, and the restrictions. The power of attorney may further include an authority URL or a certificate of the authority for accessing the authority. The power of attorney shall be accompanied by the signature of the power of attorney. Delegation authority includes authority to create RO and authority to manage domain. Constraints include the size of the domain, the kinds of permissions that the generated RO can have, and the constraints that must be included in the RO.

Power of attorney: = {

Delegator ID,

Officer ID,

Delegation Period,

Delegation Authority,

Constraints,

Cert _delegate ,

Sign _delegate

}

Issued a power of attorney LRM this RO By importing DRM  How to pass to Agent:

A description with reference to FIG. 4 is as follows.

1. The Certificate Authority issues a certificate to the LRM. The certificate issuing process follows the well-known X.509 based certificate issuing process, and the specific method is not the scope of the present invention.

2. LRM requests delegation from RI to obtain a power of attorney. (LRM_RI_Delegation Protocol)

A. LRM requests delegation from RI. The delegation request message includes at least the ID of the LRM, the ID of the RI, the time of message transmission, one or more authorizations to request, and a signature for the entire message. The message may further include a cert of the LRM.

B. RI handles delegation request messages. RI verifies the signature of a message. If a cert is included in the delegation request message, the RI confirms that the LRM is certified by a certificate authority that is trusted by the RI, and verifies whether the certificate is revoke through a CRL or OCSP provided by the certificate authority. RI verifies that the requested authority in the delegation request message is acceptable. RI prepares a delegated response message. The delegation response message contains at least a success or failure, the ID of the RI, the ID of the LRM, and the signature of the entire message. The response message may further include a power of attorney if success is successful or not.

C. In step B, the delegation response message generated by RI is sent to the LRM.

The LRM_RI_Delegation Protocol may be implemented together with the registration protocol that LRM performs for authentication, version, and algorithm negotiation with RI.

3. LRM imports content from other DRM systems. As a result of import, Rights Object and DRM Content are derived.

4. The LRM delivers the Rights Object derived from step 3 and the power of attorney to the DRM Agent. (LRM_Agent_RO Delivery Protocol)

A. LRM forwards RO delivery request message to DRM Agent. The RO transfer request message includes at least the ID of the LRM, the ID of the DRM agent, the RO signed by the LRM, and the power of attorney. The request message may further include a LRM cert or a MAC or signature for the entire message.

B. The DRM Agent processes the RO transfer request message. The DRM Agent searches the RI Contexts of the DRM Agent for the RI ID in the proxy and checks whether there is a match. If there is no matching RI ID, it means that the DRM Agent is not registered with the RI specified in the power of attorney. In this case, it can be registered with the RI with the user's consent. To register with RI, you use the RIURL in your power of attorney. The method of registering to RI using RIURL is not the scope of the present invention and can be implemented by referring to OMA DRM 2.0. If there is a matching RI ID, the LRM ID in the power of attorney verifies that the RO signer is correct and the RO's signature is verified. Verification of the signature may include checking the revoke status of the certificate. If there is a MAC or signature for the entire message in the request message, it is verified. If no error, DRM Agent installs RO of request message. If there is no error, the DRM Agent generates an RO transfer response message. The RO transfer response message includes at least a success or failure, an ID of the DRM agent, and an ID of the LRM. The response message may further include a MAC or signature of the Cert or the entire message of the DRM Agent.

The DRM Agent sends the RO transfer response message to the LRM. LRM verifies if a MAC or signature is included for the entire message. If the failure in the response message succeeds, the protocol terminates. If success fails, the user of LRM can be notified.

LRM Generated by RO Through RI DRM  Go to Agent:

A description with reference to FIG. 5 is as follows.

1. LRM transfers RO and Power of Attorney to DRM Agent using LRM_Agent_RO delivery protocol.

2. The DRM Agent sends the RO, State Infomation, and Power of Attorney to the RI using the ROAP_Rights mobile protocol.

A. The DRM Agent sends a Rights Movement Request message to RI. The request message includes at least the ID of the DRM Agent, the ID of the RI, the message delivery time, the RO signed by the LRM, and the power of attorney. The request message further includes a State Infomation when Rights is stateful. The request message may further include a MAC or a signature.

B. RI processes the Rights movement request message received in this step. RI verifies that the power of attorney was issued by itself. RI verifies that the LRM that signed the RO matches the LRM specified in the Power of Attorney. The verification method checks whether the LRM ID in the RO matches the LRM ID of the proxy and verifies the RO signature using the LRM ID and the public key of the LRM coupled. If there are no errors, RI generates a Rights Response message. The Rights Mobile Response message contains at least a success or failure, the ID of the RI, and the ID of the DRM Agent. The response message may further include a MAC or Signature for the entire message.

C. RI forwards a Rights Response message to the DRM Agent. The DRM Agent verifies if the response message is MAC or Signature. If the failure in the response message is a failure, the user of the DRM agent can be notified.

3. RI issues the RO to the second DRM Agent using the Legacy RO Acquisition Protocol (1-pass or 2-pass RO Acquisition Protocol).

1 is a block diagram showing a digital rights management system.

2 is a prior art.

3 is a basic concept of delegation.

4 is RO transfer to the DRM Agent using the power of attorney.

5 is to move the RO generated in the LRM to another DRM Agent through the RI.

Claims (19)

(A) receiving, through the LRM_RI_Delegation Protocol, a Power of Attorney (RRM) from the Rights Issuer (RIM) that includes RO issuance rights; (B) LRM issuing a Rights Object (RO) within the scope of the power of attorney received; rights delegation authority usage method comprising a. The method of claim 1, wherein in the step (A), the LRM and RI protocol is Sending, by the LRM, a delegation request message requesting delegation to the RI; And receiving, by the LRM, a delegation response message including the power of attorney generated by the RI from the RI. The power of claim 1, wherein the power of attorney At least one of a deputy's ID, a deputy's ID, a delegation period, a delegation authority, restrictions, a signature of the power of attorney, and a certificate of the power of attorney, Wherein the delegator ID is an ID of the RI, and the ID of the delegate is an ID of the LRM. The method of claim 3, wherein the delegation authority A method for delegating rights to issue rights comprising at least one of a right to create an RO and a right to manage a domain. The method of claim 2, wherein the delegation request message is Including the ID of the LRM, the ID of the RI, the time of message transmission, the authority to request, and the signature of the message for the delegation request, In addition, the rights delegation authority delegation method characterized in that it further comprises a certificate of the LRM (cert). The method of claim 2, wherein the delegate response message Method for delegation of rights to use, characterized in that it comprises information indicating a successful failure to confirm the delegation request message, the ID of the RI, the ID of the LRM, the signature (signature) for the delegation response message. The method of claim 2, wherein the RI is Check the signature and certificate included in the received delegation request message, and if the delegation request message is authenticated from a trusted Certificate Authority (CA), generating a power of attorney characterized in that generating a power of attorney. How to delegate authority. The method of claim 1, wherein the LRM_RI_ delegate protocol The delegation method of claim right, wherein the LRM can be implemented with a registration protocol performed for authentication, version, and algorithm negotiation with the RI. The method of claim 1, Importing, by the LRM, content from another DRM system; And deriving a right of use (RO) and a DRM content from the imported content by the LRM. The method of claim 9, The method of claim 1 further comprising the step of delivering the derived rights and the power of attorney to the DRM agent through the LRM_Agent_RO delivery protocol. 11. The method of claim 10, wherein the LRM_Agent_RO delivery protocol The LRM forwarding a RO transfer request message to the DRM agent; And receiving, by the LRM, a RO transfer response message sent by the DRM agent after verifying the RO transfer request message. The method of claim 11, wherein the DRM agent is Method of issuing rights to issue rights, characterized in that to install (RO) included in the RO transfer request message if there is no problem by verifying the RO transfer request message. 12. The method of claim 11, wherein the RO transfer request message An ID of an LRM, an ID of the DRM agent, an RO signed by the LRM, and a power of attorney; Method for delegation of rights to use, characterized in that it may include a certificate (RM) of the LRM or MAC or signature (signature) for the RO transfer request message. 12. The method of claim 11, wherein the RO transfer response message Method for delegation of the right to use rights, characterized in that it comprises information informing the success of the verification of the RO transfer request message. Receiving a delegation request message requesting the delegation of RO issuance authority from a Rights Issuer (RI) through the LRM_RI_Delegation Protocol; After the RI confirms the delegation request message, generating a power of attorney for RO issuance authority; And the RI sending a delegation response message including the power of attorney to the LRM through the LRM_RI_Delegation Protocol. The power of claim 15, wherein the power of attorney And at least one of the delegation's ID, the deputy's ID, the delegation period, the delegation authority, the restrictions, the signature of the power of attorney, and the certificate of the power of attorney, where The delegate ID is an ID of the RI, the delegate ID is an ID of the LRM, The delegation authority delegation authority usage rights delegation method characterized in that it comprises at least one or more of the right to create a RO, the right to manage a domain (Domain). Receiving, by the first DRM agent, the RO and the power of attorney from the Local Rights Manager (LRM) using the LRM_Agent_RO delivery protocol; And causing the first DRM agent to deliver the RO to a second DRM agent by a rights issuer (RI) using the ROAP_Rights mobile protocol. 2. 18. The method of claim 17, wherein the first DRM agent is And a state information of the RO and a power of attorney further transmitted to the RI. The method of claim 17, wherein the RI is And a method of transferring the RO to the second DRM agent using a legacy RO Acquisition protocol.

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